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<div class="title">Acorn128.h</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (C) 2018 Southern Storm Software, Pty Ltd.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * copy of this software and associated documentation files (the "Software"),</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * The above copyright notice and this permission notice shall be included</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * in all copies or substantial portions of the Software.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#ifndef CRYPTO_ACORN128_H</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span><span class="preprocessor">#define CRYPTO_ACORN128_H</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include "AuthenticatedCipher.h"</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// The ACORN-128 state consists of 293 bits split across six</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// Linear Feedback Shift Registers (LFSR's) and 4 bits spare.</span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// In this implementation, each LFSR is represented by a</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// 48-bit or 64-bit register split into 32/16-bit words.</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// The optimized reference implementation from the algorithm's</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// authors uses 7 uint64_t registers, for a total state size</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// of 448 bits. This version uses 328 bits for same data and</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// should be efficient on 8-bit and 32-bit microcontrollers.</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">typedef</span> <span class="keyword">struct</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> {</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  uint32_t k[4]; <span class="comment">// Cached copy of the key for multiple requests.</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  uint32_t s1_l; <span class="comment">// LFSR1, 61 bits, 0..60, low word</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  uint32_t s1_h; <span class="comment">// LFSR1, high word</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  uint32_t s2_l; <span class="comment">// LFSR2, 46 bits, 61..106, low word</span></div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  uint16_t s2_h; <span class="comment">// LFSR2, high word</span></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  uint16_t s3_h; <span class="comment">// LFSR3, 47 bits, 107..153, high word</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  uint32_t s3_l; <span class="comment">// LFSR3, low word</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  uint32_t s4_l; <span class="comment">// LFSR4, 39 bits, 154..192, low word</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  uint16_t s4_h; <span class="comment">// LFSR4, high word</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  uint16_t s5_h; <span class="comment">// LFSR5, 37 bits, 193..229, high word</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  uint32_t s5_l; <span class="comment">// LFSR5, low word</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  uint32_t s6_l; <span class="comment">// LFSR6, 59 bits, 230..288, low word</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  uint32_t s6_h; <span class="comment">// LFSR6, high word</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  uint8_t s7; <span class="comment">// Top most 4 bits, 289..292</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  uint8_t authDone; <span class="comment">// Non-zero once authentication is done.</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> } Acorn128State;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// Determine which Acorn128 implementation to export to applications.</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#if defined(__AVR__)</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor"></span><span class="preprocessor">#define CRYPTO_ACORN128_AVR 1</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor"></span><span class="preprocessor">#else</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor"></span><span class="preprocessor">#define CRYPTO_ACORN128_DEFAULT 1</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="classAcorn128.html"> 67</a></span> <span class="keyword">class </span><a class="code" href="classAcorn128.html">Acorn128</a> : <span class="keyword">public</span> <a class="code" href="classAuthenticatedCipher.html">AuthenticatedCipher</a></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <a class="code" href="classAcorn128.html#af42823fb01dcbdeb8a93fa4103edebf2">Acorn128</a>();</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">virtual</span> <a class="code" href="classAcorn128.html#a170c189599a1cf332db5496dd6bc1df4">~Acorn128</a>();</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">size_t</span> <a class="code" href="classAcorn128.html#af13cffd088e6ec25f9f781bea22fba12">keySize</a>() <span class="keyword">const</span>;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">size_t</span> <a class="code" href="classAcorn128.html#a4141564021e8233727beb5b9f645dc4e">ivSize</a>() <span class="keyword">const</span>;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordtype">size_t</span> <a class="code" href="classAcorn128.html#a75c8953cea6b9cd59aa5034dfe739889">tagSize</a>() <span class="keyword">const</span>;</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordtype">bool</span> <a class="code" href="classAcorn128.html#a2a2b2285ffc4d0ed57d661d739d22302">setKey</a>(<span class="keyword">const</span> uint8_t *key, <span class="keywordtype">size_t</span> len);</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordtype">bool</span> <a class="code" href="classAcorn128.html#ae4e9ecf2030c4d2e3f32a19f937de845">setIV</a>(<span class="keyword">const</span> uint8_t *iv, <span class="keywordtype">size_t</span> len);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordtype">void</span> <a class="code" href="classAcorn128.html#a4273a0b1eb880d98e34f2f9123fa167b">encrypt</a>(uint8_t *output, <span class="keyword">const</span> uint8_t *input, <span class="keywordtype">size_t</span> len);</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">void</span> <a class="code" href="classAcorn128.html#a7eacfc496f19b691207f64ba58b4c14a">decrypt</a>(uint8_t *output, <span class="keyword">const</span> uint8_t *input, <span class="keywordtype">size_t</span> len);</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">void</span> <a class="code" href="classAcorn128.html#a9a893539010c729c7d93a7acfd76ae67">addAuthData</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *data, <span class="keywordtype">size_t</span> len);</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordtype">void</span> <a class="code" href="classAcorn128.html#a333c98509f0ba55dff684d54781c0242">computeTag</a>(<span class="keywordtype">void</span> *tag, <span class="keywordtype">size_t</span> len);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">bool</span> <a class="code" href="classAcorn128.html#a0a1c914c76d15af00bbb348f160bbacb">checkTag</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *tag, <span class="keywordtype">size_t</span> len);</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">void</span> <a class="code" href="classAcorn128.html#ac98fa6f3ad9f12b090d678d94ffff56f">clear</a>();</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  Acorn128State state;</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> };</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="preprocessor">#endif</span></div>
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<div class="ttc" id="classAcorn128_html_af13cffd088e6ec25f9f781bea22fba12"><div class="ttname"><a href="classAcorn128.html#af13cffd088e6ec25f9f781bea22fba12">Acorn128::keySize</a></div><div class="ttdeci">size_t keySize() const </div><div class="ttdoc">Gets the size of the Acorn128 key in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00064">Acorn128.cpp:64</a></div></div>
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<div class="ttc" id="classAcorn128_html_a4273a0b1eb880d98e34f2f9123fa167b"><div class="ttname"><a href="classAcorn128.html#a4273a0b1eb880d98e34f2f9123fa167b">Acorn128::encrypt</a></div><div class="ttdeci">void encrypt(uint8_t *output, const uint8_t *input, size_t len)</div><div class="ttdoc">Encrypts an input buffer and writes the ciphertext to an output buffer. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00554">Acorn128.cpp:554</a></div></div>
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<div class="ttc" id="classAuthenticatedCipher_html"><div class="ttname"><a href="classAuthenticatedCipher.html">AuthenticatedCipher</a></div><div class="ttdoc">Abstract base class for authenticated ciphers. </div><div class="ttdef"><b>Definition:</b> <a href="AuthenticatedCipher_8h_source.html#l00028">AuthenticatedCipher.h:28</a></div></div>
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<div class="ttc" id="classAcorn128_html_ac98fa6f3ad9f12b090d678d94ffff56f"><div class="ttname"><a href="classAcorn128.html#ac98fa6f3ad9f12b090d678d94ffff56f">Acorn128::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Clears all security-sensitive state from this cipher object. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00677">Acorn128.cpp:677</a></div></div>
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<div class="ttc" id="classAcorn128_html_a333c98509f0ba55dff684d54781c0242"><div class="ttname"><a href="classAcorn128.html#a333c98509f0ba55dff684d54781c0242">Acorn128::computeTag</a></div><div class="ttdeci">void computeTag(void *tag, size_t len)</div><div class="ttdoc">Finalizes the encryption process and computes the authentication tag. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00631">Acorn128.cpp:631</a></div></div>
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<div class="ttc" id="classAcorn128_html_a7eacfc496f19b691207f64ba58b4c14a"><div class="ttname"><a href="classAcorn128.html#a7eacfc496f19b691207f64ba58b4c14a">Acorn128::decrypt</a></div><div class="ttdeci">void decrypt(uint8_t *output, const uint8_t *input, size_t len)</div><div class="ttdoc">Decrypts an input buffer and writes the plaintext to an output buffer. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00580">Acorn128.cpp:580</a></div></div>
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<div class="ttc" id="classAcorn128_html_a170c189599a1cf332db5496dd6bc1df4"><div class="ttname"><a href="classAcorn128.html#a170c189599a1cf332db5496dd6bc1df4">Acorn128::~Acorn128</a></div><div class="ttdeci">virtual ~Acorn128()</div><div class="ttdoc">Destroys this Acorn128 authenticated cipher. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00054">Acorn128.cpp:54</a></div></div>
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<div class="ttc" id="classAcorn128_html_a2a2b2285ffc4d0ed57d661d739d22302"><div class="ttname"><a href="classAcorn128.html#a2a2b2285ffc4d0ed57d661d739d22302">Acorn128::setKey</a></div><div class="ttdeci">bool setKey(const uint8_t *key, size_t len)</div><div class="ttdoc">Sets the key to use for future encryption and decryption operations. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00477">Acorn128.cpp:477</a></div></div>
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<div class="ttc" id="classAcorn128_html"><div class="ttname"><a href="classAcorn128.html">Acorn128</a></div><div class="ttdoc">ACORN-128 authenticated cipher. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8h_source.html#l00067">Acorn128.h:67</a></div></div>
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<div class="ttc" id="classAcorn128_html_a4141564021e8233727beb5b9f645dc4e"><div class="ttname"><a href="classAcorn128.html#a4141564021e8233727beb5b9f645dc4e">Acorn128::ivSize</a></div><div class="ttdeci">size_t ivSize() const </div><div class="ttdoc">Gets the size of the Acorn128 initialization vector in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00077">Acorn128.cpp:77</a></div></div>
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<div class="ttc" id="classAcorn128_html_a0a1c914c76d15af00bbb348f160bbacb"><div class="ttname"><a href="classAcorn128.html#a0a1c914c76d15af00bbb348f160bbacb">Acorn128::checkTag</a></div><div class="ttdeci">bool checkTag(const void *tag, size_t len)</div><div class="ttdoc">Finalizes the decryption process and checks the authentication tag. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00660">Acorn128.cpp:660</a></div></div>
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<div class="ttc" id="classAcorn128_html_ae4e9ecf2030c4d2e3f32a19f937de845"><div class="ttname"><a href="classAcorn128.html#ae4e9ecf2030c4d2e3f32a19f937de845">Acorn128::setIV</a></div><div class="ttdeci">bool setIV(const uint8_t *iv, size_t len)</div><div class="ttdoc">Sets the initialization vector to use for future encryption and decryption operations. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00495">Acorn128.cpp:495</a></div></div>
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<div class="ttc" id="classAcorn128_html_af42823fb01dcbdeb8a93fa4103edebf2"><div class="ttname"><a href="classAcorn128.html#af42823fb01dcbdeb8a93fa4103edebf2">Acorn128::Acorn128</a></div><div class="ttdeci">Acorn128()</div><div class="ttdoc">Constructs a new Acorn128 authenticated cipher. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00046">Acorn128.cpp:46</a></div></div>
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<div class="ttc" id="classAcorn128_html_a75c8953cea6b9cd59aa5034dfe739889"><div class="ttname"><a href="classAcorn128.html#a75c8953cea6b9cd59aa5034dfe739889">Acorn128::tagSize</a></div><div class="ttdeci">size_t tagSize() const </div><div class="ttdoc">Gets the size of the Acorn128 authentication tag in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00087">Acorn128.cpp:87</a></div></div>
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<div class="ttc" id="classAcorn128_html_a9a893539010c729c7d93a7acfd76ae67"><div class="ttname"><a href="classAcorn128.html#a9a893539010c729c7d93a7acfd76ae67">Acorn128::addAuthData</a></div><div class="ttdeci">void addAuthData(const void *data, size_t len)</div><div class="ttdoc">Adds extra data that will be authenticated but not encrypted. </div><div class="ttdef"><b>Definition:</b> <a href="Acorn128_8cpp_source.html#l00606">Acorn128.cpp:606</a></div></div>
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